The reporter learned from the Ministry of Ecology and Environment on the 25th that from March 25th to 28th, atmospheric diffusion conditions continued to be unfavorable in Beijing-Tianjin-Hebei and surrounding areas, and a relatively large-scale pollution process will occur.

At present, Beijing, Tianjin, Shijiazhuang, Taiyuan, Zhengzhou, Jining and other 34 prefecture level cities and above have issued orange warnings, to take timely measures to reduce emissions, and to remind the public to do a good job of health protection.

The national air pollution control and prevention association experts conducted a predictive analysis and concluded that in the late March, the general circulation of the atmosphere in North China was active. With the subtropical high, the temperature increased continuously, and the southerly and easterly warm winds vapor a large amount of water to the Jing-Jin-Ji and surrounding areas, and it is prone to adverse weather conditions such as calm and high humidity.

With respect to pollutant discharge, with the end of the heating period, various types of industrial enterprises that have been peaking in autumn and winter have begun to resume production. While the reduction in civilian heating emissions, emissions from industrial production and cargo transportation have increased significantly. Because Beijing-Tianjin-Hebei and its surrounding areas are characterized by heavy chemical-based industries and road-based transport structures, the emission intensity of major pollutants is still at a high level.

For this pollution process, the forecast results show that, beginning on March 25th, the atmospheric circulation in the upper atmosphere is stable, and the middle layer continues to heat up. The regional diffusion conditions are unfavorable. Affected by the near-surface southerly wind and the early-inverse temperature inversion, pollutants will be in Beijing, the central and southern parts of the city, the central and northern cities of the Bohai Bay, and the urban clusters of the Liaozhong Province have gradually accumulated. On the 27th, the spread conditions further deteriorated, and it is expected that the contaminated area will continue and may be extended to cities along the eastern side of Taihang. On the 29th, due to the influence of cold air from the northeast, the pollution process in the central part of Beijing, Tianjin, Hebei, and the downstream cities of Beijing, Tianjin and Hebei, and Henan, etc. were affected by the pollution, and short-term moderate to severe pollution may occur. Experts said that the situation of pollution mitigation in the later period needs further tracking and analysis.